Bleaching pulp with high-pressure o2

Details Bleaching pulp with high-pressure o2 Bleaching pulp with high-pressure o2

D - Textiles, Paper

21

C

D21C 9/147 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2376528

A process for oxygen bleaching pulp in which the pulp is pre-treated prior to oxygen bleaching (52), e.g. to remove the hexeneuroonic acid. Oxygen bleaching (36, 42) is accomplished at high pressure in two stages with a medium consistency pump (32). The wash from the bleaching stage is not recycled into the chemical recovery system. A final whitening sequence includes at least one chlorine dioxide stage followed by an alkaline peroxide stage with no intervening wash is also included.

L'invention concerne un procédé de blanchiment d'une pulpe à l'oxygène, dans lequel la pulpe est prétraitée préalablement au blanchiment (52) à l'oxygène, par exemple pour en éliminer l'acide hexène-uronique. Le blanchiment à l'oxygène (36, 42) est réalisé sous haute pression, en deux étapes, au moyen d'une pompe à moyenne concentration (32). Le liquide de lavage résultant de l'étape de blanchiment n'est pas recyclé dans le système de récupération chimique. Une séquence de blanchiment finale inclut au moins une étape où le dioxyde de chlore est employé, suivie d'une étape où le peroxyde alcalin est employé sans intervention de lavage.

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